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SIM 90?

I recieved this strange looking small yellow sticker in the mail the other day, and I can’t figure out what it’s for. It has the letters S I M written on it inside this weird looking shape. Next to that is the number 90 in bigger letters. The sticker is only about one or two inches across, and it’s yellow with red lettering with a shiny/sparkling finish. I wonder, is it an acronym for something, or maybe some kind of code? To make it even more confusing, the envelope that it came in says to put it on my license plate. If anyone can help me figure out what this is for, I sure would appreciate it. And who knows, maybe there’s a bunch of other people that recieved a sticker like this and are just as confused as I am. Whatever the case may be, something needs to be straightened out here.